.backend-layout {
    height: 100vh;
    overflow: hidden;
  }
  
  .container {
    height: 100%;
  }
  
  /* 侧边栏样式 */
  .sidebar {
    background-color: #304156;
    transition: width 0.3s;
    overflow-x: hidden;
  }
  
  .logo-container {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px 0;
    border-bottom: 1px solid #1f2d3d;
  }
  
  .logo-img {
    width: 40px;
    height: 40px;
    margin-right: 10px;
  }
  
  .logo-text {
    color: #fff;
    font-size: 18px;
    font-weight: 600;
  }
  
  .el-menu-vertical {
    border-right: none;
  }
  
  /* 主内容区样式 */
  .main-container {
    background-color: #f0f2f5;
    overflow: auto;
  }
  
  /* 顶部导航样式 */
  .header {
    background-color: #fff;
    box-shadow: 0 1px 4px rgba(0, 21, 41, 0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
  }
  
  .header-left {
    display: flex;
    align-items: center;
  }
  
  .collapse-btn {
    font-size: 20px;
    cursor: pointer;
    margin-right: 20px;
  }
  
  .breadcrumb {
    margin-left: 10px;
  }
  
  .header-right {
    display: flex;
    align-items: center;
  }
  
  .user-info {
    display: flex;
    align-items: center;
    cursor: pointer;
  }
  
  .user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
  }
  
  .user-name {
    font-size: 14px;
    color: #606266;
    margin-right: 5px;
  }
  
  /* 主内容区样式 */
  .main-content {
    padding: 20px;
  }
  
  .dashboard-summary {
    margin-bottom: 20px;
  }
  
  /* 修改卡片内容样式 */
  .data-card {
    height: 100%;
    margin-bottom: 20px;
  }
  
  .card-content {
    display: flex;
    flex-direction: column;
    padding: 10px 0;
  }
  
  .card-value {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #303133;
  }
  
  .dashboard-summary .el-card {
    transition: all 0.3s;
  }
  
  .dashboard-summary .el-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  }
  
  .card-footer {
    display: flex;
    align-items: center;
  }
  
  .trend {
    font-weight: bold;
    margin-right: 10px;
  }
  
  .trend.up {
    color: #67C23A;
  }
  
  .trend.down {
    color: #F56C6C;
  }
  
  .trend-text {
    color: #909399;
    font-size: 12px;
  }
  
  .recent-orders, .product-ranking {
    margin-top: 20px;
  }
  
  .card-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .trend-column {
    display: flex;
    flex-direction: column;
  }